Ship project history: Largest
attack submarines of
WWII-era Italian Navy. The project
was developed by builder. Single-hulled, with external bulges. This class
submarines were intended, first of all, for operations against merchant shipping on ocean
routes. In connection with that torpedoes calibre was decreased, but the number of spare torpedoes
was sharply increased. Thanks to large dimensions Cagni
class submarines had good seaworthiness and habitability, thus differed by quite good manoeuvrability.

In 1943
Ammiraglio Cagni was converted to transport submarine for
routes to Japan.

Modernizations: 1943, Ammiraglio Cagni: was
converted to transport.

Naval service: Ammiraglio Caracciolo was scuttled by crew 11/12/1941 near Bardia, having received heavy damages after attack of British escort destroyer
Farndale. Ammiraglio Saint-Bon
was sunk 5/1/1942 N off Sicily by British submarine Upholder.
Ammiraglio Millo was sunk 14/3/1943 in Ionian sea by
British submarine Ultimatum.